I am very new to linux (4 days trying) and dont know whats up or down with this thing.

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If youre new to Linux then the centos setup is not a good starting point as its much more complicated to install and maintain then other distributions. You should consider to use this guide here instead which is the recommended guide for ISPConfig 3 and nginx:

If youre new to Linux then the centos setup is not a good starting point as its much more complicated to install and maintain then other distributions. You should consider to use this guide here instead which is the recommended guide for ISPConfig 3 and nginx:

Id rather choose an operating system best for my server not for my skills. Ubuntu is horrible Ive tried it and hated it. I like centos so far I'm learning but this support forums isn't great if you don't help others instead give them criticism on what operating system a noob should use.

I asked for help on how to fix my PHP problem not what version of linux should a noob use.

The server IS SETUP its online and working but PHP is not running that is my problem, whenever i place a PHP file in the nginx folder it gives a 403 page error when html files are there it works no problems.

Id rather choose an operating system best for my server not for my skills. Ubuntu is horrible Ive tried it and hated it. I like centos so far I'm learning but this support forums isn't great if you don't help others instead give them criticism on what operating system a noob should use.

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I recommended you the operating system thats best for your server when you want to use ispconfig. That its easier to install is just a side affect.You might remember this when your system crashed the first time on centos updates due to package dependency conflicts or when you want to update to centos 7 in future and find out that its wont work. Regarding Ubuntu, I guess you mean Ubuntu desktop? I talk about Ubuntu server.

The server IS SETUP its online and working but PHP is not running that is my problem, whenever i place a PHP file in the nginx folder it gives a 403 page error when html files are there it works no problems.

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Then post the exact error messages form your global and website log files and the ls -la output from your web folder.